G. LAOMEDEA. 
91 
distant from each other ; colour yellow fawn ; height 
about two decimetres. 
Indian ocean. 
SIMPLE. 
3. Laomedea simplex. Stem simple ; cells long, 
campanulated, and dispersed ; colour a deep brown ; 
height two decimetres. 
On the fucus of Australasia. 
M. LAIR’S. 
4. Laomedea Lairii . Base or root branched ; 
stem simple, or very slightly branching ; cells dis- 
persed, diverging, and supported on long peduncles ; 
colour red-brown ; height a centimetre. 
Australasian seas. 
DICHOTOMOUS. 
5. Laomedea dichotoma . Stem dichotomous, and 
geniculated ; cells campanulated ; ovaria axillary, and 
supported on curved peduncles. 
European seas. 
THORNY. 
6. Laomedea spinosa . Cells very small, almost 
invisible ; branches dichotomous, and terminated by 
two bristly appendages; base composed of inter- 
woven tubes. 
European seas. 
JOINTED. 
7. Laomedea geniculata . Stem geniculated and 
uneven ; ovaria oval, truncated, and pedicelled ; pedi- 
cle curved. 
European seas. 
